How weld parts on skinned mesh avatar?

So recently my friend made human body model on blender, than we put on roblox, its working fine, but i need weld a sword on the body, but it need be possible to animate, tryed look that tutorial on dev forum: It is possible to weld parts to bones? but i still not able to do the same.

The model FBXImportGeneric - Roblox

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